Notoriously or preëminently bad; thorough or downright, in a bad sense; shameless; unmitigated; as, an arrant rogue or coward.

Thorough or downright, in a good sense.

without qualification; used informally as (often pejorative) intensifiers; "an arrant fool"; "a complete coward"; "a consummate fool"; "a double-dyed villain"; "gross negligence"; "a perfect idiot"; "pure folly"; "what a sodding mess"; "stark staring mad"; "a thoroughgoing villain"; "utter nonsense"